PDFBOX-4892: refactor to avoid the need of null check, remove unneeded comment

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1893697 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/JPEGFactory.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/JPEGFactory.java
index 108679b..94231b2 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/JPEGFactory.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/image/JPEGFactory.java
@@ -355,13 +355,10 @@
     private static void encodeImageToJPEGStream(BufferedImage image, float quality, int dpi,

                                                 OutputStream out) throws IOException

     {

-        // encode to JPEG

+        ImageWriter imageWriter = getJPEGImageWriter(); // find JAI writer

         ImageOutputStream ios = null;

-        ImageWriter imageWriter = null;

         try

         {

-            // find JAI writer

-            imageWriter = getJPEGImageWriter();

             ios = ImageIO.createImageOutputStream(out);

             imageWriter.setOutput(ios);